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  <script>

    const obj = {
      name: "zs",
      sayHello() {
        console.log('this  ----->  ', this);
      },
      // 💥箭头函数本身没有this， this会自动指向它所处的环境（上下文）
      sayHi: () => {
        console.log('this  ----->  ', this);
      }
    }

    obj.sayHello();

    obj.sayHi()

  </script>
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